mobilizon/lib/service/metadata/event.ex
2020-01-26 21:39:49 +01:00

54 lines
1.5 KiB
Elixir

defimpl Mobilizon.Service.Metadata, for: Mobilizon.Events.Event do
alias Phoenix.HTML
alias Phoenix.HTML.Tag
alias Mobilizon.Events.Event
alias Mobilizon.Web.JsonLD.ObjectView
alias Mobilizon.Web.MediaProxy
def build_tags(%Event{} = event) do
event = Map.put(event, :description, process_description(event.description))
tags = [
Tag.content_tag(:title, event.title <> " - Mobilizon"),
Tag.tag(:meta, name: "description", content: event.description),
Tag.tag(:meta, property: "og:title", content: event.title),
Tag.tag(:meta, property: "og:url", content: event.url),
Tag.tag(:meta, property: "og:description", content: event.description),
Tag.tag(:meta, property: "og:type", content: "website")
]
tags =
if is_nil(event.picture) do
tags
else
tags ++
[
Tag.tag(:meta,
property: "og:image",
content: event.picture.file.url |> MediaProxy.url()
)
]
end
tags ++
[
Tag.tag(:meta, property: "twitter:card", content: "summary_large_image"),
~s{<script type="application/ld+json">#{json(event)}</script>} |> HTML.raw()
]
end
defp process_description(description) do
description
|> HtmlSanitizeEx.strip_tags()
|> String.slice(0..200)
|> (&"#{&1}").()
end
# Insert JSON-LD schema by hand because Tag.content_tag wants to escape it
defp json(%Event{} = event) do
"event.json"
|> ObjectView.render(%{event: event})
|> Jason.encode!()
end
end